Make ImageDerivative resolver configurable to return additional properties

[chasinhues]

ImageDerivative only returns image url, width, and height.

graphql/src/Plugin/GraphQL/DataProducer/Entity/Fields/Image/ImageDerivative.php

Lines 132 to 136 in 582704b

	return [
	'url' => $url,
	'width' => $dimensions['width'],
	'height' => $dimensions['height'],
	];

I would like to be able to access other properties of the entity as well, such as ID, filename, etc.